Stereoscope



22, 1932.v L. PARosELLl 1,850,153

STEREOSCOPE Filed June l1. 1929 2 Sheets-Sheet l March 22, 1932.PAROSELLI STEREOSCOPE Filed June ll. 1929 2 Sheets-Sheet 2 azzornqyPatented Mu. 22,1932

UNITED STATES PATENT y or-FlcE LEOPOLD PAEOBELLI, I' mm CITY, NEW JERSEYSTEBEOSOOPE Application led .Tune 11, 1929. Serial No. 870,128,

My invention relates to improvements in stereoscopes intended for use inthe production of stereoscopic pictures. It is recognized that devicesof this type 'must be reduced to simplest form, and lightest Weight foruse of manipulation. At the same time the prisms must be readilyadjustable to insure accurate apparent coincidence of the images. E

It is an object of this invention to provide a light but substantialcasing for these fle- Vices and to assemble thereiny an improvedstereoscopic unit of the above type.

It is a further object of the invention to mount the two prisms inidentical manner so that both may be adjusted in focusing.

The act of focusing is carried out, according'to this invention, by theuse of a single operating means of improved design connected with bothprisms.

Other advantages and improvements in general larrangement and specificdetails will be apparent from the following description of lthepreferred form of my invention as illustrated in theaccompanyingdrawings in which,

f Fig. 1 is a side elevationof the stereoscope; f Fig. 2 is a planviewwith the top broken away; f

Fig. 3 is a vertical section on the line 3 3 of Fig. 2;

' Fig. 4 is a horizontal section on the line 4-4 of Fig. 3 and lookingupwardly;

Fig. 5 is a transverse vertical section on the line 5-5 Aof Fig. 1;

Fig. 6 is a similar transverse vertical section on the line 6-6 of Fig.l and Fig. 7 is a diagram illustrating the action ofthe prisms.

The invention is shown as consisting ofa casing of compact dimensionscont'aininor a pair of prisms so mounted on a removable supportingmember that they may be adjusted simultaneously by a common meansoutside of the casing. The casing 1, may be been illustrated by way ofexample as formed by an integral metallic casting of aluminum or thelike. One 'side wall 2 of the casing has a channel or recess 3intersecting the edge of the casing and the bottom as well.

Fjournals for an operating shaft 19. This shaft has one projecting end20 on which is of any. convenient form or material but has" This channelis of convenient size to receive the bridge of the nose of the personusing the stereoscope. In the side wall of the casing and appropriatelyspaced on each side of the channel 3 is an aperture 4, which is opposltethe eye of the operator and transmit the light rays from the objectobserved.

The opposite side of the casing has been shown open although theinvention permits of a side wall or partition being used to cover thedevice when desired.

Ledges 5, 5 are cast or otherwise mounted onthe inner sides ofY the endWalls 6, 6 and run parallel to the bottom 7 and top 8. One end wall isslotted as at 9 to permit the in- 05 sertion of an operating shaft.Through the top 8 there is a threaded hole 10 which receives a lockingbolt 11.

The ledges 5, 5 form Slides or guides Vfor receiving and holding asupporting member denoted generally by the numeral' 12. This member hasa bottom plate 13, a front 14 and end walls 15 and 16. The member formsa support for the prism holders andthe associated operating means. Forthis purpose the plate has pins 17 17 plrojectin below the surface ofthe plate as s own in igs. 3 and 6 and serving as pivots vfor the prismholders. The plate is also slotted 'at 18, 18 in karcs around 17, 17 ascenters so that the prism holders may be freel pivoted around 17, 17respectively from tlie upper side of the plate 13.

End walls 15 and 16 are apertured'to form attached a knurled nut 21 tofacilitate operation. The end 20 projects through/the slot 9 in theendwall 6 as shown in Figs. 2 and 4 with the nut 21 outside the'casing.9o

I The shaft `19 has a right-hand thread 22 anda left hand thread 23meeting at a center portion 24 and extending outwardly toward the endwalls of the supporting mem- On each threaded section of the shaft 19there is carried a similarly threaded traveler or collar 25, 25. Thesetravelers have extended bases 26, 26 whichare slotted as at 27. Athreaded bolt 28 is held in each aperim tured 27 by a nut 29' and locknut 30. The enlarged countersunk head 31 of the bolt 28 extends beneaththe plate 13 to suspend'the.

prism holder.

The prism holders 32 consist of base plates 33 of generally tetragonalshape as shown in Figui One angle is extended as at 34 and supports anangle bar 35 having a recess perpendicular to plate 33. A backlate 36 isheld against the opposite sides of t e plate 33 b tlie like. The lowerend of back-plate 36 is bent into a plane parallel to plate 33 andextends as bottom 39 substantially to the angle bar 35. Asfshown in Fig.6 thehead 31 of bolt 28 is received within the plate 33.

The prism holder 32 has one corner apertured to receive the pivot pin17. Prior to assembly of the prism holder it is fitted with a prism 40of optical glass which has yone edge held in the recess of angle bar 35while the opposite side is against the back-plate 36 with the bottom andtop in contact with 39 and 33 respectively.

The prism holders are vassembled with the supporting member by bringingthe bolts 28 through the intersecting slots 18 of the plate 13 and slots27 of vbases 26 respectively. The lock nuts are then tightened to holdthe prism holders up near the under side of plate 13 but Jfree to movearound pivot pins 17.

The supporting member vis then slid along the ledges 5, 5,' until themember `is against wall 2 with the prisms opposite the apertures 4, 4.This brings the adjusting nut 2l outside the casing. The devices aremaintained in this position by the locking bolt 11 or equivalent device.An apertured partition for this side of the casing may serve the samepurpose.

It will be apparent that movement ofthe adjusting nut 21 will rotate theprisms simultaneously about the pins 17 and in reverse directions.` Thiswill result in prompt and accurate adjustment of the images A B intodesirezd coincidence as shown in the diagram Fie'.

stereoscope made according to the above arrangement provides a light,rigid frame quite easy to hold and operate. The location of the pivotfor the prism on the edge nearest the eye permits the desired focusingwithout disturbance to the position of the eyes. The mechanism formaking the adjustment is simple and etlicient and is operable by onehand only.

Many changes in specific structural details and minor proportions. willsuggest themselves to one skilled in this art asbeing within the scopeof the invention as set forth in the following claims.

What I claim is:

1. In combination, a supporting member, two spaced pivots on saidmember, a revolu- 'ble shaft journaled on said member, said means ofaflange 37 and screwsA 38 .or

remise shaft having right and left threaded portions, a traveler on eachthreaded portion, a pair of prisms, a holder for each prism, and meansfor attaching a holder to a traveler and for drawin the holder intooperative engagement with one of said pivots.

2. In combination, a supporting member having slots, two spaced pivotson one side of said member, a revoluble shaft journaled in spacedrelation to the opposite side of said member, said shaft having rightand left threaded portions, a traveler on each threaded portion andoverlying a 'slot in said supporting member, a pair of prisms, a holderfor each prism and means assing throu h the slots for attaching a hol erto a trave er and for drawing the holder into operative engagement withone of said'pivots.

3. In combination, a supporting member,y

a pair of prisms, a holder for each prism, each holder being pivoted atone point on said supporting member, a stud on each holder, an adjustingshaft journaled on the su porting member, right `and left threads on t eshaft, a traveler on each thread, each of said travelers engaging thestud on one holder and means on the said stud for drawing the hold-l erinto engagement with said ivot.

4. In combination, a casing aving a rear wall open to light, spacedopenings in the opposite wall for parallel beams of light, a supportingmember within the casing, a pair of prisms, a holder for each prism,means on the supporting member for pivoting each holder along one edgeof the prism, and means for simultaneously moving the holders aroundsaid pivots.

In testimony whereof, I affix m signature.

i LEOPOLD PAR SELLI.

